Total votes
2,984
all sessions
Attendance
100%
of floor votes
Higher than 91% of chamber peers
With party
98%
of cast votes
Near the chamber average
Bipartisan score
1%
crosses aisle rarely
Near the chamber average
Sponsored
57
bills & resolutions
Lower than 80% of chamber peers
Committees
8
assignments
Co-sponsorship network
Legislative network
Legislators build coalitions through co-sponsorship. These are the 10 lawmakers Sen. Costello co-sponsors with most often: a window into their policy partnerships, their coalition within the caucus, and the rare cases where they reach across the aisle.
Top partners
10
Within party
10
Across aisle
0
Strongest tie
Jason Schultz
Closest allies
Ranked by bills co-sponsored together across all sessions.
01
Jason Schultz
31bills together
Compare →
02
Jeff Edler
30bills together
Compare →
03
Ken Rozenboom
29bills together
Compare →
04
Julian Garrett
27bills together
Compare →
05
Brad Zaun
25bills together
Compare →
06
Amy Sinclair
23bills together
Compare →
07
Annette Sweeney
22bills together
Compare →
08
Tim Kraayenbrink
21bills together
Compare →
09
Dennis Guth
21bills together
Compare →
10
Jesse Green
20bills together
Compare →
Explore the full network
See Sen. Costello's co-sponsorship relationships as an interactive graph. Filter by topic, session, or party to trace coalitions and identify the brokers between them.
Ask Maddy
·
AI policy assistant
Ask Maddy about Mark Costello
Scope: iowa
Hi! I can help you understand Mark Costello's legislative record. What would you like to know?
Try one of these
i
Maddy answers using official bill text and legislative records. Always verify before sharing.
Sources cited inline