polls show the GOP's Supreme Court obstructionism could hurt the party in 2016.

The ghost of former Supreme Court Justice Antonin Scalia and the specter of Donald Trump haunt Senate Republicans in 2016. The death of the former set up what could be an ugly political conundrum for Republican incumbents, and the ascent of the latter has them facing the prospect of their own candidate generating tsunami-like backlash. Either way or especially in combination, the list of endangered senators could prove larger than is now commonly believed.

Take the Scalia vacancy. Please. Within moments of the justice's death, Republicans, led by Senate Judiciary Committee Chairman Chuck Grassley had whole cloth invented an inviolable principle that the president not nominate and the Senate not confirm Supreme Court nominees in an election year. The principle was bunk – the details don't bear up under honest examination. And I wrote early on that it seemed taking the maximally obstructionist position was blowing the politics by starting from a position of shameless gridlock. Supreme Drag -- Supreme Court Vacancy Obstinacy Is Hurting Donald Trump and the GOP

More bad polling news for Donald Trump: Voters in a half-dozen Senate swing states (which are also largely presidential swing states) don't trust him to select the late Justice Antonin Scalia's replacement – and they largely don't support him for president.

Overall the issue continues to be a drag on Republicans in key states.

PPP polled registered voters in Arizona, Iowa, New Hampshire, Ohio, Pennsylvania and Wisconsin for Americans United for Change and the Constitutional Responsibility Project, asking them, among other things, about whom they want picking Scalia’s replacement. Almost across the board, they prefer Obama to Trump: Excepting Arizona, the voters prefer Obama by 9 to 17 percentage points. (Obama led 46-45 in the Grand Canyon state, which was within the margin of error; in Iowa the president led 49-39, in New Hampshire 53-39, Ohio 50-41, Pennsylvania 51-42, Wisconsin 54-37.) It’s not clear why they tested Trump versus Obama but not Trump versus Clinton.

Where they did test Trump versus Clinton was in the presidential matchup. Clinton holds an 8-percentage point lead in Wisconsin (47-39) and leads (barely) outside the margin of error in Pennsylvania (46-42), Ohio (44-40) and New Hampshire (43-39); she's got a within-the-margin-of-error lead in Iowa (41-39) and Trump's got a lead that's barely outside the margin in Arizona (44-40). Honestly those 4-point leads aren't great for Clinton but leading is better than the alternative – and no Democrat has gotten close to a 4-point deficit in Arizona since Bill Clinton won the state in 1996