Robert's got it bang-on. The Riesling isn't strong enough to stand up to the acidity of a tomato sauce. If you were doing a traditional turkey with stuffing, then it would be a very good pairing. It also works well with pork dishes.

Something rustic and Italian, such as the Sangiovese, Chianti or perhaps a Montepulciano would work. But it needs to have some heft to it in order to stand up to pasta sauce.

__________________
Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)