They never said, did they? Aside from this line...
Whenever there's a billion dollars to hand out to special interests, influential members of Congress—Democrats and Republicans—are always lurking in the background.
If it were mostly Republicans, I confidently believe Time would have named names. Since they didn't, I'm just as confident that this is mostly a Democrat-driven scam. The original timeframe and objective of the tax credit strongly suggests that it was a Democrat feel-good initiative -- written to benefit Democrat donors.
If decisions had to be made based entirely upon economic facts of life there might be hope for a real solution, not one based upon who gets the taxpayers money.