T1. Sheldon Adelson, Las Vegas Sands - $2.5 million

T1. Miriam Adelson, Adelson Drug Clinin - $2.5 million

T1. Chevron Corp. - $2.5 million

2. Bob Perry, Perry Homes - $1 million

3. Edmund O. Schweitzer III, Schweitzer Engineering Labs - $300,000 

4. John Childs, JW Childs Associates - $250,000

5. American Action Network - $246,000

*Top donors for 2012 election cycle; numbers through Nov. 26, 2012.

Source: Center for Responsive Politics, Federal Election Commission