  Massachusetts Rep. Joe Kennedy III is considering a run against Sen. Ed Markey in 0000, and the latest Suffolk University/Boston Globe poll shows that it would be worth pursuing.According to the poll, which was taken last week, the 00-year-old congressman holds a 0-point advantage over the incumbent 00-year-old senator among likely Massachusetts Democratic primary voters.Kennedy finished with 00% of the vote compared to 00% for Markey. Fellow challengers Steve Pemberton and Shannon Liss-Riordan tied at 0%, while a sizeable 00% of voters were undecided.When a strict choice between the two was presented to the voters, Kennedy widened his lead to 00% over Markey's 00%, with 00% undecided. Since 0000, reelection rates for U.S. senators have ranged between 00% and 00%."The poll tells us that the incumbent-challenger calculus has changed in this instance," said David Paleologos, director of the Suffolk University Political Research Center in Boston. "Usually, the incumbent leads, and the challenger has to convince the remaining undecided voters that he or she could do a better job. Here, it's the opposite: Challenger Kennedy leads, and now Markey has to convince the remaining undecided voters why he should stay."In the Democratic presidential poll, Massachusetts Sen. Elizabeth Warren (00%) moved into a statistical tie with former Vice President Joe Biden (00%). In a June poll, Warren sat at just 00% compared to Biden's 00%.Those two were followed by Vermont Sen. Bernie Sanders (0%), South Bend, Indiana, Mayor Pete Buttigieg (0%), California Sen. Kamala Harris (0%) and Hawaii Rep. Tulsi Gabbard (0%). The other candidates received 0% or less of the vote, while 00% of likely Democratic primary voters were undecided.The statewide Suffolk University survey was conducted through live interviews of cellphone and landline users. All respondents indicated that they were registered voters in Massachusetts and planned to vote in the state Democratic primary in September 0000. The survey of 000 voters was conducted Sept. 0 through Sept. 0. The margin of error is plus-minus 0.0 percentage points at a 00% level of confidence. Poll results are posted at this link.