Mitt Romney, Utah: $13,647,676
Richard Burr, North Carolina: $6,987,380
Roy Blunt, Missouri: $4,555,722
Thom Tillis, North Carolina: $4,421,333
Cory Gardner, Colorado: $3,939,199
Marco Rubio, Florida: $3,303,355
Joni Ernst, Iowa: $3,124,773
Rob Portman, Ohio: $3,063,327
Todd C. Young, Indiana: $2,897,582
Bill Cassidy, Louisiana: $2,867,074
The full list contains 50 senators in total.