The Democratic primary for a Pennsylvania Senate seat that’s key to future control of the chamber is shaping up to be expensive and crowded, with Lt. Gov. John Fetterman setting the pace with a substantial early cash haul. Fetterman’s receipt of $3.9 million in first quarter contributions already is starting to affect the 2022 race to replace retiring Republican Patrick Toomey, according to outside analysts and campaign aides. “It certainly helps” get him attention and support from national Democrats seeking to expand their majority, said J. Miles Coleman, an analyst at the UVA Center for Poli...