Big money donors dominated the campaign finance filings by the two leading candidates for governor, Republican Greg Abbott and Democrat Wendy Davis. Abbott demonstrated his fundraising prowess over the last half year with 25 six-figure donations, including a total of $900,000 from the late Dallas billionaire Harold Simmons. And Davis scored not one but two million-dollar donations — from Austin doctor Carolyn Oliver and from the Mostyn Law Firm of Houston.