I’m used to thinking that if Republicans are close on the generic-ballot question, they’re in pretty good shape.

So I’m not used to hearing things like this from Gallup:

Gallup Daily tracking for the week ending April 11 puts Republicans slightly ahead of Democrats, 48% to 44%, in the congressional voting preferences of registered voters nationally. This marks the third week since the U.S. House passed healthcare reform on March 21 that the Republicans have tied or led the Democrats . . . The trend based on registered voters shows how rare it is for the Republicans to lead on this “generic ballot” measure among all registered voters, as they do today. Other recent exceptions were recorded in 1994 — when Republicans wrested majority control from the Democrats for the first time in 40 years — and 2002, when the GOP achieved seat gains, a rarity for the president’s party in midterm elections.