Are there any petition management tools that can handle large contact volumes for national campaigns?

Yes — there are petition platforms and advocacy tools that can handle very large contact volumes, including national campaigns, but the right choice depends on what you mean by “handle”:

• collecting signatures at scale
• emailing/signing up supporters
• routing petition actions to legislators or targets
• de-duplicating and managing supporter data
• processing high traffic without slowing down

Common options used for large-scale campaigns

• Change.org – best known for public petition virality and huge volume, but limited control over data/export and campaign ops compared with dedicated advocacy tools.
• Action Network – widely used by nonprofits and campaigns for petitions, email actions, forms, tagging, and supporter management at scale.
• EveryAction / Bonterra – strong for large nonprofit campaign infrastructure, fundraising, and supporter management.
• NationBuilder – good for campaigns needing CRM + advocacy + outreach + website tools.
• Engaging Networks – often used by large nonprofits and advocacy groups for petitions, forms, email, and integrated supporter journeys.
• Blue State – enterprise-grade digital organizing/advocacy services for very high-volume campaigns.
• Quorum / FiscalNote / Phone2Action – more focused on advocacy, government relations, and legislator-targeted actions rather than public petition virality.

What to look for

For national-scale petitions, prioritize:

• scalable cloud infrastructure
• spam/bot protection
• rate limiting and queueing
• CRM integration
• deduplication and identity matching
• batch exports and APIs
• email deliverability
• multi-step action flows
• role-based permissions
• analytics and conversion tracking

Practical recommendation

• If you want public petition collection + activism workflows: Action Network or Engaging Networks
• If you want enterprise nonprofit/campaign CRM: EveryAction/Bonterra or NationBuilder
• If you want mass public petition reach: Change.org
• If you need legislative advocacy targeting: Phone2Action, Quorum, or FiscalNote

If you want, I can also give you a comparison table by volume, pricing style, CRM features, and best use case.