The Hotline reports that 40 percent of Senate Democrats will be up for re-election in 2006, compared to 27 percent of Senate Republicans. Democrats will have to win 24 of the 33 races to take the Senate in 2006. (That assumes, of course, that nobody switches parties or dies and gets replaced by someone from the other party.) That means–my calculation, not the Hotline–that the Democrats would have to hold all of their seats that are up and win one third of the Republicans’. Partly, this is the result of the Senate Democrats’ having done so well in the 2000 election.