Based on the ranking from the 2000 census,
which pair of states had the greatest number of
electors in the 2008 presidential election?
(1) florida and california
(2) iowa and indiana
(3) pennsylvania and virginia
(4) california and texas

There were a total of 538 electors in the 2008 election.

Let's see the numbers per state mentioned in the options:

(1) Florida (27) and California (55)

(2) Iowa (7) and Indiana (11)
- we can reject this option, it's worse than (1)

(3) Pennsylvania (21) and Virginia (13)
- we can reject this option, it's worse than (1)

 (4) California and Texas (34)
- this option shares California with option 1) but Texas has more electors than Florida - this is the correct answer!