Congress is already preparing to probably do some pretty serious work after the election. We’re in the last month of the fiscal year. That means appropriations bills, or continuing resolutions, to fund the government and avoid shutdown on October 1st.
Earlier this week an agreement was reached on 3 of the 12 departments. Work continues on the others, with the possibility of nine mentioned as possibly being funded before month end. There’s already an agreement for a Continuing Resolution to fund the parts without an appropriations bill until early December. (Cite)
Neither party wants to play shutdown chicken 5 weeks before an election. Neither wants to be stuck in DC wrangling with budgets instead of on the campaign trail in October. It’s not really surprising that they have already made a deal that lets them hit the campaign trail even though the final budget is unlikely to be done.