According to the Boston Globe, Rep. Ed Markey from MA-07 won't run in the special election to fill Ted Kennedy's Senate seat:
Markey, a Malden Democrat, said he could do more as a senior member in the House than as a freshman US senator. He has been active on global warming issues and on health care.
"I have had the honor to serve the people of the Seventh Congressional District in the U.S. House of Representatives for 33 years, and am now the eighth most senior Democrat," he said in a statement. "I believe that my leadership positions and seniority in the House allow me to accomplish more for my Congressional District and for Massachusetts. I have therefore decided not to become a candidate for the Senate.
Markey's seniority would certainly be hard to give up. Although he has the largest warchest of all the current members of the House delegation, he probably also saw only a difficult path to victory, with AG Martha Coakley with a substantial polling lead thanks to her statewide presence, and with Reps. Stephen Lynch and Michael Capuano already battling it out for Boston-area votes.
Former White House Chief of Staff Andy Card (R) announced Friday night that he would not run. "Now is not the right time for me to enter a political race," he said in a statement.