The people acting like you can't buy elections in this thread are being very disingenuous. There's tons of examples on the Republican side, but just to deflect the inevitable "partisan hack blah blah" response, I'll give another example. Just look at Tom Wolf, who went from a nobody polling at 1% to completely demolishing a field of Democrats in the primary then unseating the incumbent governor. This wouldn't have been possible without his ability to self fund.
Sure but he would have lost if not for the Penn State scandal. Money means more in primaries rather than general elections. It's also debatable if he would have won the nomination if a more well known Pennsylvania Democrat had run.
There are tons of examples of people who spend a ton of money and lose. You still have to win the support of voters. Money can make getting your message out easier but it can't save a bad message. Romney 2012 is a great example of this.