Online gambling "could" be used to launder money, Let's review this...

[Moneyline]

I think the best way to approach the money laundering argument is to not only emphasize that there hasn't been a single reported case of this actually happening, but also emphasize that this is a case of politicians playing the terrorism card to try to gain support for an unrelated issue. Many people feel the government used terrorism as an excuse to enact bad policy (Iraq, Patriot Act, etc.) and therefore calling out politicians for manipulating the terrorism issue should be an effective rhetorical device.