Texas Majority PAC, which received millions in seed funding from George Soros, has quietly but rapidly ramped up its operation to elect Democrats in Texas, new campaign finance filings show. The PAC spent over $5 million between July 1 and Sept. 26, a dramatic increase from the low six-figure disbursements the group was sending out when it first launched, according to state records. Soros provided roughly half of the $4.4 million Texas Majority PAC raised between July and September, a haul that comes as control of the House could hinge on a handful of close congressional races in the state and…