U.S. Sen. John Cornyn spent $5.5 million during crunch time of Texas' Republican primary.
And that princely sum helped ensure he crushed a quixotic challenge from the right by fellow Republican U.S. Rep. Steve Stockman.
Campaign Manager Brendan Steinhauser told The Associated Press that Cornyn raised $2.32 million in the year's first quarter and had nearly $3.35 million in cash on-hand March 31.
The campaign ended 2013 with $6.5 million in its war chest -- meaning that $5.47 million was spent ahead of the March 4 primary. That mostly went to radio, television and Internet advertising across Texas' vast and costly media markets.
Cornyn garnered 59 percent of the primary vote, trouncing Stockman and six little-known challengers.
He is now the overwhelming favorite to win a third term in November.