It wouldn't shock me if this gets done; the Nationals were interested in Hudson last year, and he would give them the defensive upgrade they so desperately need in the middle infield. Plus, they signed another Greg Genske client--Adam Dunn--to a deal late in the winter last season.
The price will be the key, though, especially since they owe Cristian Guzman $8 million this season. But I don't get the sense the Nationals have necessarily shut their checkbook yet.
Between Austin Kearns, Dmitri Young, Nick Johnson, Ronnie Belliard and Wily Mo Pena, the Nats cleared more than $20 million in salaries or dead money from last year's payroll.
They've spent about $14 million of that on Matt Capps, Jason Marquis and Ivan Rodriguez, so even if they only were spending money they've cleared from last year, they've got some cash left.
I still think it's possible the Nats will make a couple more moves--maybe to add another veteran pitcher, in addition to a middle infielder--and if the payroll goes up, it seems like they're prepared to deal with that.