U.S. Rep. Kevin Mullin is far outraising his challengers in California’s 15th Congressional District, with more than half of his contributions coming from other political committees, including PACs tied to health care, pharmaceuticals and biotech interests, industries affected by his work in Congress. Mullin, a Democrat seeking reelection in a district considered safely Democratic, reported raising $720,687 through May 13, according to the latest federal campaign finance filings.