Even as the tea party movement vows to spend $250,000 in the coming days to defeat Rep. Michael N. Castle, campaign officials from both sides of the aisle concede that Castle should capture the Republican Senate nomination in next week's Delaware primary.

Senate Colorado -- A new poll, conducted jointly by a Republican polling firm and a Democratic polling firm, has Democratic Senator Michael Bennet up 43 percent to 40 percent over Ken Buck. This is still pretty grim news for Bennet, who has been below 46 percent in every poll conducted by someone other than PPP [...]

FREDERICA, Del. — Conservative Republicans around the country are using cap and trade — a way to limit global-warming pollution — as a political weapon to attack GOP moderates as well as Democrats.

These races will decide whether the Senate follows the House in going Republican this fall.

Democratic seats in play: