Spouses are restricted by campaign finance law, and can only donate the maximum $4,300. She can use 50% of jointly held assets like real estate, but she can't just dip into his earnings as a public speaker without first converting it into real estate. See here: <link>

Anyway, as an Obama supporter, I'm pretty encouraged by this news. His staggering fundraising ability is not only going to propel his campaign long past February, but one of the reasons the Clintons held sway over the party for so long was their ability to raise money.