Elections Intelligence

Illinois 15th District

DEFENDED SEATSafe R

Mary E. Miller (R) has held this seat since 2021 and is running for re-election. Before that: John Shimkus (R).

Jennifer Todd Challenger
5.1¢
Party market · checked 2:09 PM ETView on Kalshi ↗
96.8¢
Mary E. Miller Incumbent

FTP Race Signal

FTP Race SignalA composite of market, polling and money. The prediction-market price anchors it; a polling average moves it: the last 30 days, or the three most recent pollsters when fewer polled. Polls paid for by a candidate, party or allied group move 2 points toward the other side and count half. When the three most recent independent pollsters each have the race within three points, it is a Toss-up unless the market is already decisive. Fundraising counts only at a five-to-one gap. Past results are context, not inputs. A rating changes only when the evidence clears the line.

The market prices this seat about where its history left it: a 99-point Republican hold in 2024, priced at 96.8¢ today.

Safe R
Safe DLikely DLean DToss-upLean RLikely RSafe R
Fundraising · Lean RR 11.75-to-1 in receipts. Market · Safe RR 96.8¢: traders' price for a Republican hold. Prior result · Safe RR+99 in 2024.

No public polls. The market favors Miller.

As of October 12.

Market

BandPRICEToss-up50¢ to 65¢Lean65¢ to 82¢Likely82¢ to 95¢Safe95¢ and above
R 96.8¢

Kalshi party market · checked 2:09 PM ET

View market on Kalshi ↗

Polling

BandPOINTSToss-up0 to 5Lean5 to 10Likely10 to 20Safe20 and above
—

Prior result

BandPOINTSToss-up0 to 5Lean5 to 12Likely12 to 25Safe25 and above
R+99.0

Mary E. Miller (R)

99.5% to 0.5% · 2024 general election

def. William Bonnett (D). Margin verified against retrieved official results.

Fundraising

BandRATIO TO 1Parity1 to 5Lean5 and above
R 11.75 to 1

Raised 2025 to 2026 · thru Jun 30

Jennifer Todd$113.3K ↗$33.8K cash
Mary E. Miller$1.33M ↗$810.4K cash

Total receipts in the 2025 to 2026 two-year cycle, through June 30, 2026.

The general election is on November 3, which is 22 days away.