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greater likelihood the house flips than the senate. >> he blames candidate quality. but who's to blame for that? we're going to look at the key races where warning signs are flashing for the gop. plus, when americans think of the irs, accountants come to mind, but some republicans are now portraying the agency as an armed strike force. the potentially dangerous implications of the party's escalating rhetoric. we're going to start, though, with that affidavit and the doj's investigation. joining me right now, nbc news correspondent sam brock in west palm beach, florida. nbc's juli...

Of russian attacks on nuclear military sites in crimea? >> the big question has been whether ukraine was behind those explosions here. now a ukrainian russian official tells me that saboteurs, ukrainian partisans who oppose russia's occupation of crimea were involved in those attacks. we're also hearing a u.s. official who says that the united states government has put no restrictions on ukraine using u.s.-provided long-rain weapons to hit targets in crimea, because of the fact that the u.s., the international community, considers crimea still to be part of ukraine. lindsey? >> josh letterman ...