Not a dumb question, at all.
Nunes, nor his staff, ever read the underlying intelligence used to obtain the FISA warrant against Carter Page. The only republican who read the intelligence and the Page FISA warrant was Trey Gowdy. Gowdy did not write the memo or have any part in writing the memo. So how exactly did Nunes get ahold of all this info? Some say it came from the White House (illegally) while others believe it's just a giant concoction of lies. This is why the FBI, DOJ, Senate, House Dems....basically anyone not affiliated with Trump....were screaming bloody murder about the release of this bullshit memo. Oh, don't forget the Nunes and Paul Ryan used an old law that has NEVER been used in American history to get around releasing classified info to the public.
Dem Rep. Schiff, like Gowdy, has read the warrant and the underlying intelligence. He has publicly said (as Gowdy has hinted at) that there are a whole lot of misleading and out-of-context statements in the Nunes memo. He wants a Dem memo released (voted on unanimously today for release by the House, we'll see if Trump approves) that clarifies and provides context to the baseless claims presented by Nunes.
The dem memo is not so much partisanship as it is transparency and not allowing Trump/Nunes to blow smoke up Americans' asses to distort their trust in the FBI and DOJ while Trump is being investigated.