1. Fear of backlash: Political corruption is a sensitive topic that can potentially harm a candidate's reputation. They may avoid mentioning it to prevent any negative reactions from the public.

2. Lack of concrete solutions: Political corruption is a complex issue that cannot be solved with a simple pledge. Candidates may avoid mentioning it because they do not have a clear plan or solution to address it.

3. Focus on popular issues: Candidates often focus on popular and pressing issues that are more likely to gain support from voters. Political corruption may not be seen as a priority by the majority of voters, so candidates may choose to focus on other issues.

4. Avoiding controversy: Bringing up political corruption may lead to debates and controversies, which can be detrimental to a candidate's campaign. They may choose to avoid the topic altogether to prevent any potential backlash.

5. Lack of accountability: Some candidates may be involved in or have ties to political corruption themselves. Mentioning it could lead to questions about their own integrity and accountability, so they may choose to avoid the topic entirely.