Is there any point voting for a president who cannot get anything through congress?
I have thought that many times myself. It seems to amount to a bait and switch. A presidential candidate can make all the claims about what laws they would enact, but presidents don't enact laws. Congress does. Obama could campaign for a full on universal, single payer, socialist medical system but that will never happen because it would never get through Congress. I also really doubt that Romney could get a bill through Congress that would privatize both Social Security and Medicare.
It's a bit like presidential candidates who campaign as pro-lifers. Do they ever really intend on pushing a pro-life bill through Congress, or even expect it to pass? Absolutely not. It is a lot of hot air. It reminds me of the Tea Party trying to repeal the ACA 30 some times in a row. It's just a waste of time.
The real focus needs to be on changing Congress, both the ideology of the members as well as the culture within DC.