Mike O'Brien (D) has raised the most money in the Democratic primary for Pennsylvania's 10th Congressional District, taking in $414,360 since the start of the campaign cycle. 

O'Brien raised $260,037 in the fourth quarter of 2023. Janelle Stelson (D) has raised the next most in the primary, with $283,214 since the start of the campaign. This fundraising is from the fourth quarter alone.

The primary will take place on April 23. Seven candidates raised a combined $876,949 through Dec. 31, 2023. Looking at all 125 congressional battlegrounds we are tracking, this is less than the average of $3.41 million. 

Five candidates raised a combined $3.76 million running in Pennsylvania's 10th Congressional District in 2022, while four raised $9.26 million in 2020.

Below is how much each Democratic candidate has raised and spent so far during the 2023-2024 election cycle:

Looking at O'Brien and Stelson alone: 

• 282 donors donated to O'Brien's campaign last quarter.
• Of those 282, the largest share, 141 (50%), donated between $100 and $499.
• 387 donors donated to Stelson's campaign last quarter. 
• Of those 387, the largest share, 172 (44%), donated between $100 and $499. 

The next reporting deadline for congressional candidates is April 15, 2024. Those reports will cover the period of Jan. 1 to March 31, 2024. To learn more about this race, click below.