T1. Sheldon Adelson, Las Vegas Sands Corp. - $15 million

T1. Miriam Adelson, Adelson Drug Clinic - $15 million

2. Bob Perry, Perry Homes - $10 million

3. Oxbow Carbon LLC - $3.75 million

4. Larry Ellison, Oracle Corp. - $3 million

5. Harold Simmons, Contran Corp. - $2.3 million 

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

Source: Center for Responsive Politics, Federal Election Commission