Sen. Joe Manchin (D-W.Va.) is betting that as many as 15 Senate Democrats will back a GOP-led bill that strips EPA’s power to regulate greenhouse-gas emissions. His estimate of Democratic support is far above what is widely believed and would put the measure — which might receive a Senate vote next week — on the brink of the 60 votes needed or over the top. Manchin, in a West Virginia radio interview this morning, said he’s urging fellow Democrats to back Senate Minority Leader Mitch McConnell’s (R-Ky.) amendment to small-business legislation. “Other people might not, but I believe there’ll be...