The 1948 Republican National Convention was held in Philadelphia, Pennsylvania. It was the first presidential convention to be shown on television. As the convention opened, Dewey was seen as having a large lead in the delegate count. His major opponents – Taft, Stassen, and Senator Arthur H. Vandenberg of Michigan – met in Taft's hotel suite to plan a "stop-Dewey" movement. However, a key obstacle soon developed when the three men refused to unite behind a single candidate to oppose Dewey. Instead, all three men simply agreed to try to hold their own delegates in the hopes of preventing Dewey from obtaining a majority. This proved to be futile, as Dewey's efficient campaign team gathered up the delegates they needed to win the nomination. After the second round of balloting, Dewey was only 33 votes short of victory. Taft then called Stassen and urged him to withdraw from the race and endorse him as Dewey's main opponent. When Stassen refused, Taft wrote a concession speech and had it read at the start of the third ballot; Dewey was then nominated by acclamation. Dewey then chose popular Governor Earl Warren of California as his running mate. Following the convention, most political experts in the news media rated the GOP ticket as an almost-certain winner over the Democrats.