Republicans are supporting Republicans and Democrats are supporting Democrats, but the Independents who determine elections are breaking decidedly towards the Republicans (even in Democratic polls).
Given the roughly equal numbers of registered Democrats and registered Republicans, independents are the closest measure of the median (center) position of political thought in America. (Since 40% of Americans are conservative and only 20% of Americans are "liberal" or leftist, the remaining 40% that identify as "moderate" do not straddle the center, but rather skew to the left.)
As Democrats and Republicans have similar proportions nationally, independents are a far more center-based group than left-leaning "moderates".
On Gallup's generic congressional ballot question, Independents (among registered voters) would prefer to vote for a Republican rather than a Democrat by a margin of 47-34. Among all registered voters, voters would prefer a Republican by a margin of 49-43. This represents the highest preference for Republicans in 48 years of Gallup polling history. Even in 1994 and 2002, the margin was only 5 points in Republicans' favor among registered voters. (Often registered voters skew more Democratic than those who actually show up on election day, especially in non-presidential years. Hence, the preferred method among many pollsters is to screen for LIKELY voters, not simply registered voters. Likely voters tend to lean even more pro-Republican than do registered voters.) Evidence suggests that 2010 may be even a more pro-Republican year than 1994 or 2002 or any other year since Gallup began asking this question in 1962.
But does the mood favor not just Republicans in general, but specific Republicans in specific races? Congressional polling is harder to find and is not often released publicly this far in advance of election day. But numerous statewide senate polls have been conducted and do confirm a shifting of the general electorate and Independents in particular toward Republicans.
Using the most recent publicly available statewide polling data from one particular Democratic polling firm (Public Policy Polling), we find that Republicans more often than not lead Democrats among independents -- sometimes by commanding double-digit leads.
Ky: Rand Paul (R) leads Conway (D) 44-29
MO: Roy Blunt (R) leads Carnahan (D) 47-35
Burr (R) leads Cunningham (D) 41-32
Burr (R) leads Marshall (D) 40-38
Bennet (D) leads Norton (R) 42-40
Buck (R) leads Bennet (D) 40-39
Bennet (D) leads Wiens (R) 39-35
Norton (R) leads Romanoff (D) 40-35
Buck (R) leads Romanoff (D) 36-34
Romanoff (D) leads Wiens (R) 35-33
Portman (R) leads Fisher (D) 37-25
Portman (R) also led Brunner (D) 37-25
Sestak (D) leads Toomey (R) 35-34
Toomey (R) led Specter (D) 41-38
IL: Kirk (R) leads Giannoulias (D) 33-30
Lowden (R) leads Reid 62-27
Tarkanian (R) leads Reid 55-30
Lowden (R) leads Berkley 55-24
Tarkanian (R) leads Berkley 53-27
Lowden (R) leads Goodman 48-30
Tarkanian (R) leads Goodman 50-30
Lowden (R) leads Miller 51-19
Tarkanian (R) leads Miller 50-18
Boozman (R) leads Lincoln 66-20
Boozman (R) leads Halter 56-18
Ayotte (R) leads Hodes (D) 49-34
Binnie (R) leads Hodes (D) 46-36
Binder (R) leads Hodes (D) 39-37
Lamontagne (R) ties Hodes 38-38
FL: Crist (I) 35 - Rubio (R) 24 - Meek (D) 22
Based on this sample of polls, top priorities for conservatives, Republicans, and friends of liberty would be Pennsylvania (Pat Toomey) and Illinois (Mark Kirk) and Colorado (nominee yet to be determined). Mark Kirk may not be the ideal candidate, but we are so close to electing a new Republican majority in BOTH houses of Congress that we need to keep our eyes on the prize. As flawed a candidate as Kirk may be, he is so much better than the mob banker Alexi Giannoulias.