This quote from Grunwald's article referenced above perfectly illustrates what happened:
David Obey, then chairman of the House Appropriations Committee, met with his GOP counterpart, Jerry Lewis, to explain what Democrats had in mind for the stimulus and ask what Republicans wanted to include. Jerry’s response was, "I’m sorry, but leadership tells us we can’t play,” Obey told me. “Exact quote: ‘We can’t play.’ What they said right from the get-go was, It doesn’t matter what the hell you do, we ain’t going to help you. We’re going to stand on the sidelines and bitch.”
Read that again: "I'm sorry, but the leadership tells us we can't play. It doesn't matter what the hell you do, we ain't going to help you." The Republican leadership had decided that there would be zero bipartisanship, zero cooperation by Republicans in Congress. Anything the Obama administration wanted to make happen, the Republicans would oppose even if they had supported it in the past.
This explains not only the Republican flip-flops on cap and trade to address anthropogenic global warming, and the individual mandate to ensure access to quality health care for all Americans, both of which were once signature Republican positions; it also explains why they filibustered this bill that cut tax breaks for companies that shipped jobs overseas and at the same time gave tax breaks to companies that brought jobs back to America from overseas. It explains why they filibustered this bill (which filibuster the Dems eventually broke) that opened up billions in loans to small businesses through the SBA and gave billions more in tax breaks to small businesses. The Republicans filibustered Obama's infrastructure bill, his jobs package, and his bill to provide states emergency funding to hire teachers and first responders.
Again, it's like the Republican said: "...it doesn't matter what the hell you do, we ain't going to help you," and by their actions showed that this applied to nearly all legislation, whether good or bad, even if it had had near-lockstep support by Republicans in the past. Witness the epic obstructionism by the Republicans in the debt-ceiling debate last year that cost America our credit rating; remember when House Speaker John Boehner bragged that "I got 98% of what I wanted" in the negotiations with the White House? And yet many of the House Republicans still opposed any deal to raise the debt ceiling, no matter the consequences.