| ←1844 1845 1846 1847 1848 → Midterm elections | |
| Incumbent president | James K. Polk (Democratic) |
|---|---|
| Next Congress | 30th |
| Senate elections | |
| Overall control | Democratic hold |
| Seats contested | 19 of 58 seats[1] |
| Net seat change | Democratic +2[2] |
| House elections | |
| Overall control | Whig gain |
| Seats contested | All 230 voting seats |
| Net seat change | Whig +37[2] |
Elections occurred in the middle ofDemocratic PresidentJames Polk's term, during theSecond Party System. The election took place during theMexican–American War. Members of the30th United States Congress were chosen in this election.Wisconsin joined the union during the 30th Congress. Democrats kept control of the Senate, but lost control of the House.
In theHouse, theWhigs won major gains, turning a dominant Democratic majority into a narrow Whig majority.[3]
In theSenate, Democrats picked up a moderate number of seats, building on their majority.[4]
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