In your sentence, both "campaigning" and "lobbying" are used as gerunds (verbs taking on the function of a noun).

Cabildeo= lobbying (for a cause, to exert pressure on other or others)
Cabildear= (to) lobby

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Note added at 2004-03-03 18:17:59 (GMT)
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\"Luego de anunciadas las reformas económicas se ha iniciado un proceso de cabildeo en el Congreso Nacional, con miras de que en dicho poder se dé el ajuste necesario para que las medidas pasen con el consenso de todos los sectores involucrados...\"
http://www.cieca.org/caribe/DesarrollandoEstrategias.asp

The following is a page entitled \"Cabildeo\". The text is in English, and used \"lobbying\" for cabildeo (not \"hacer cabildeo\",because, at the risk of being repetitive, it is a gerund)

\"Why is important to lobby to national and international productive sector in Mexico?

Since 1977 the historic changes in our country have conformed the actual democracy in our country...\"
http://www.gep.com.mx/Cabildeo.aspx