Jumping off this tweet by Chuck Todd, an arrangement of data:

Amount of money raised this quarter by Harry Reid: $1.5 million.

Amount of money raised this quarter by Mark Kirk: $2.2 million.

Amount of money raised this quarter by Pat Toomey: $2.3 million.

Amount of money raised this quarter by Marco Rubio: $3.6 million.

Obviously, other factors come into play – a campaign’s burn rate and the amount of cash-on-hand, whether a state is expensive to campaign in or inexpensive, the economic circumstances in that part of the country, and so on. But this does seem interesting, as we would expect the embattled Senate majority leader, helping move the biggest Democratic agenda item in a generation through Congress, to be outraising a selection of GOP challengers, no?