The Hill 2010 Midterm Election poll, surveying nearly 17,000 likely voters in 42 toss-up districts over four weeks, points to a massive Republican wave that, barring an extraordinary turnaround, will deliver crushing nationwide defeats for President Obama’s party…

Of the 42 districts polled for The Hill, all but two of which are currently Democratic, 31 had Republicans in the lead. Democrats were up in just seven, and four were tied. In addition, there are some 15 Democratic districts that are so far into the GOP win column that they weren’t polled. That would suggest at least 46 GOP pickups, plus whatever the party gets out of another 40 or 50 seats that some experts believe are in play…

The Hill’s data confirm other public polling and expert predictions, some of which put the historic wave even higher than the 52 seats Democrats lost in 1994 and the 71 they lost in 1938.

Pollster Stuart Rothenberg wrote Tuesday that Democrats face the potential of “a political bloodbath the size of which we haven’t seen since the presidency of Franklin Delano Roosevelt.”