Clinton loaned herself another $6.4 million last month

When Clinton supposedly raised $10 million post-Pennsylvania, many of us pointed out that, if true, that was just enough to cover her campaign debt. We still don't know how much more she raised over the month, but clearly it wasn't enough.

An aide says Sen. Hillary Rodham Clinton has lent her presidential campaign $6.4 million over the past month.

The money more than doubles Clinton's personal investment in her bid for the Democratic nomination. She gave her campaign $5 million earlier this year.

With $11.4 million of her own money invested in the race, and still likely facing campaign debts, this may compel her to stay in the race. She can raise money while spending little to win West Virginia comfortably.

Of course, Bill could always do a couple of speeches to pay off that debt rather than have her small-dollar supporters foot the bill. Having made over $100 million the past eight years, and with unlimited earning potential, the Clintons could afford it.