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Blackburn's entry followed a decision earlier in the day by  term-limited Gov. Bill Haslam  to sit out the race  despite entreaties from Corker  Senate Majority Leader Mitch McConnell of Kentucky and Tennessee's senior senator  Lamar Alexander.
"While I have loved being a mayor and a governor  I don't feel the same call to run for Senate at this point " said  Haslam .  He  said the hyper-partisanship that surrounds Congress was a factor in  his  decision.
 Haslam 's popularity in the state and  his  vast personal wealth would have made  him  a strong candidate  despite lingering anger among some Republicans over  his  call to Donald Trump to abandon  his  presidential nomination last year following the release of a videotape in which Trump boasted about groping women.
Corker  who announced last week that  he  wouldn't seek a third term  also publicly criticized the Republican president  for  his  response to a deadly white nationalist rally in Virginia. Corker questioned whether Trump had the "competence" or "stability" to succeed in office.
"I believe in President Trump's immigration ban  and I'll fight with  him  every step of the way to build that wall " she said. "I stand when the president walks in room  and yes  I stand when I hear the Star Spangled Banner."
Former U.S. Rep. Stephen Fincher is another potential Republican Senate candidate  and is expected to make a decision in the coming days.  Haslam  hasn't said whether  he 'll endorse a Republican in the race.
Blackburn joins Tennessee Senate race after Haslam begs off

During the war  no one was more emblematic of the changing power dynamics than  Farah Baker   a 16-year old Palestinian girl who came to international attention for  her  social media updates about life in Gaza.  Baker  was not tied to any political group and  her  perspective on the war was a personal one. Yet  her  social media presence catapulted  her  to global attention and told the Palestinian story to the world in a way that resonated emotionally. It also empowered  Baker  as a political actor  something that  she  had never expected and that could never have occurred in any previous conflict.
During the war  no one was more emblematic of the changing power dynamics than  Farah Baker   a 16-year old Palestinian girl who came to international attention for  her  social media updates about life in Gaza.
Normally  a young teenage girl living under aerial bombardment would have been considered a bystander  at best  or a victim  at worst. But thanks to  her  Twitter feed  where  she  shared both  her  fears as well as  her  attempts to maintain normal life amid the war   Farah  became an important part of the Palestinian effort to sway global opinion on the conflict.
“At only sixteen   Farah  understood  even if only instinctively  the importance of social media in wartime  especially to a perpetual underdog like the Palestinians ” Patrikarikos wrote. “She understood the power that it gave to a single individual and to networks of individuals  power that previously would have been impossible.”
In her own small way  with her tweets and updates during the war   Farah Baker  had played a role in shifting the narrative and forcing the world to grapple with the Palestinian narrative of the conflict.
“I don’t have the ability to carry a weapon and I would never kill anyone  so my only weapon was to broadcast the truth and to let people know what was happening here ”  Baker  told Patrikarakos in an interview at  her  Gaza home. “I was more effective than I ever imagined  because of the amount of followers I got and because so many people told me I had changed their minds [about the war] and opened their eyes.”
How Social Media Is Leveling the Playing Field Between Governments Militants and Ordinary People

Image copyright Getty Images Image caption  Prime Minister of Canada Justin Trudeau  departs a press availability at the Canadian Embassy in Washington
In 2017   Canadian Prime Minister Trudeau  learned a lesson about the power of social media.
 Trudeau 's January tweet "isn't necessarily the sentiment being held by a lot of Canadians".
 Mr Trudeau  ended 2017 in an ethics quagmire partly of  his  own making.
Meanwhile   Trudeau 's finance minister  Bill Morneau  is struggling with his own ethics troubles.
A mid-December poll by the Angus Reid Institute indicated that for the first time since his election   Trudeau 's approval ratings had dropped below 50%.
 Trudeau 's ratings are still strong for a politician  but Kurl says there is "perhaps a little bit less adoration and a little bit more exasperation with the prime minister".
As the two rival leaders find their feet - and if  Trudeau  and  his  ministers keep handing them easy ammunition - 2018 could also prove a rough ride.

The tests facing Canada's PM Justin Trudeau in 2018