I don't think you understand what Denny was saying. Even if the Republicans wanted to block his agenda; they just couldn't. The Democrats had majority House and Senate. All they had to do was let it go through.
That's not exactly right.
When Obama had majorities in the house and senate, and in the depths of a severe recession, his agenda was to mandate people buy health care from the insurance companies, cap and trade, government take over of GM and gave it to the unions, $5T in deficit spending, $800B in "stimulus" that was really pork for his extremist left-wing supporters, extended unemployment benefits (disincentive to work or form capital), etc. His green energy initiative turned into a bunch of bankruptcies and lost taxpayer dollars.
Republicans took the house and have stopped that agenda and made only a dent in the structural $trillion-plus deficits in exchange for the debt ceiling increase. But they are at least brakes for the runaway train that is government. The only accomplishments for this government the past year have been that debt ceiling increase/spending cuts and tax cuts (social security).
My view is that government interference lengthened and made the recession deeper than it should have been. We've had deep recessions like this before (blame game to the contrary) and the recoveries have been much stronger and earlier. If the economy is now showing signs of coming back to some level of strength, it sure looks like it's done so since the republicans took the house and squashed much of the further damage that Obama and democrats would have done otherwise.
It's dubious that any republican candidate (other than Paul) is anything but a clown, but 4 more years of Obama and democrats would be a huge set back for the people. I don't want republicans back in power in congress and the white house, but we do need a change at the top.