Yeah, sure, been there, done that. Only if they don't get away with this one will they not get away with it in the future. If they do, forget about it. Nothing will change, they'll only be emboldened. How many times do Republicans have to bend over for the old "thank you sir may I have another?" Doesn't it get tiring and hurt after awhile to the point of wanting to fight back?
Not if you pick your battles wisely. Florida in 2000 is an example of that. James Baker and Racicot were ferocious bulldogs in that battle -- they didn't give an inch.
In contrast, Thune in SD chose to concede to Johnson in 2002 even though there was lots of evidence of fraud, esp. on India reservations. Thune bowed out gracefully, lived to fight another day, and dethroned Daschle.