Isn't there a hotel that is both connected the convention center AND has free breakfast? thanks in advance!
I don't think that there are any connected that also have a free breakfast. Now, if you don't mind going about a block out, Staybridge Suites (on S West St) had it. Embassy Suites (on W Washington St) shows that they have it as well. Fairfield Inn & Suites (on W Washington St behind the JW Marriot) says that it does also. Aside from those, you will have to start going out a few more blocks.
I think Springhill Suites might have in the past? It's been a while since I stayed there.
Embassy Suites' popularity is undoubtedly due in part to its pretty excellent free breakfast buffet (and on-demand omelette chef). I know it is only debatably connected since it is a block away, but as I understand it any hotel connected via the skywalks is technically connected!