Is the Senate Where It’s At for Ambitious House Democrats?

Is the Senate Where It’s At for Ambitious House Democrats?-rollcall: The next generation of House Democratic leaders sees opportunity for advancement — in the Senate, that is. With Maryland Sen. Barbara A. Mikulski’s retirement announcement Monday, California Sen. Barbara Boxer doing the same in January and Sen. Marco Rubio, R-Fla., likely to run for president, ambitious House Democrats could be tempted by open Senate seats in a presidential election year.